Virgil van Dijk believes the Dutchman can replace Morgan Schneiderlin after his move to Manchester United.
Sunderland are set to face Crystal Palace in the Premier League on Monday evening.
Leeds United's manager is still reportedly desperate to bring the pair to Elland Road.
Tottenham Hotspur have managed to go unbeaten in their last 11 Premier League matches.
The midfielder is fighting his way back to fitness and Sullivan is hoping he can replicate last season's performances.
The striker was forced out of Benin's game with Burkina Faso and now could miss the trip to Everton.
Derby County will face Cardiff City, Hull City, Sheffield Wednesday, Brighton & Hove Albion and Bristol City in their next five Championship matches.
Assessing the latest rumour relating to four Leeds United players.
Everton will face Aston Villa, Bournemouth, Crystal Palace and Norwich City in their next four Premier League matches.
Derby County manager Paul Clement praised the club's Irish contingent.
Newcastle United are set to overhaul their squad this summer.
Vincent Kompany could return for the final day clash against Southampton after injuring his thigh against Manchester United, according the latest reports.
The 29-year-old striker found himself back up front in the lone striker role for Leeds in Tuesday night's 2-0 defeat to Norwich, but how did he perform?